Transmitter for morse alphabet and printing telegraphy.



No. 692,426. Patented Fab. 4, I902.

L. GEBEBOTA'NI. TRANSMITTER FOB-MORSE ALPHABET AND PRINTING TELEGRAPHY.

(Application fllad Mar. 8, 1900.)

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(No Model.)

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No. 692,426. Patented Feb. 4, I902.

L. CEREBDTANI. 4, TRANSMITTER FOR MORSE ALPHABET AND PRINTING TELEGRAPHY. (Application filed mi. 8, 1900.1

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No. 692,426. Pat ented Feb. 4, I902.

L. CEREBOTANI.

TRANSMITTER FOR MORSE ALPHABET AND PRINTING TELEGRAPHY.

(Application filed M5128, 1900.) (No Model.) 3 Sheets-Sheet 3.

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UNTTED STATES PATENT OF ICE.

LUIGI CEREBOTANI, OF MUNICH, GERMANY.

TRANSMITTER FOR MORSE ALPHABET AND PRINTING TELEGRAPHY.

SPECIFICATION forming part of Letters Patent No. 692,426, dated February 4, 1902. Application filed March 8, 1900. Serial No. 7,919. (No model.)

To all whom, it may concern:

Be it known that I, LUIGI CEREBOTANI, a subject of the King of Bavaria, residing at Munich, in the Kingdom of Bavaria and German Empire, have invented certain new and useful Improvements in Transmitters for Morse Alphabet and Printing Telegraphy, of which the following is a specification.

Transmitters forsendin g messages, whether in the Morse alphabet or by printing,by means of keyboards are already known; but none of such instruments are of the same simple and reliable construction as the present arrangement,which, moreover, possesses the advantage that several m essages may be transmitted simultaneously. that on depressing the necessary key the latter remains in such position until it has caused the sign to be transmitted. This is effected by a cylinder commencing to rotate on the key being depressed and by contacts being made during the rotations corresponding to the letters to be transmitted. The key then springs up again and the cylinder on having made a full rotation stops. The chief feature of the device is a metal cylinder divided into as many zones as -there are keys. On the surface of each zone are either bright places, in which case the surface of the remaining part is non-conducting, or there are different-sized projections provided in the form of teeth or the like. These bright places or teeth serve the purpose of closing an electric circuit as soon as the respective key is depressed and such a place or tooth passes a contact-spring. Contact between spring and cylinder may be made at each spring, in which case depres sion of a key simply efiects closing of the circuit by the spring concerned, or the contact or connection of the spring at the zone in question may take place through depression of the key, whereby the latter tips a lever,

which causes a current to pass.

Peculiarities of the present invention are the manner in which, first, depression of the key through the medium of suitable wheelwork rotates the common cylinder; second, the key without being operated by the finger remains depressed until the contacts have been made; third, the contacts are made, and, fourth, after rotation the cylinder stops.

Starting and braking of the wheelwork- The arrangement is such that is, rotation and stopping of the cylinderare efiected through the displacement of an obstruction on the depression of the key until the contacts have been made. The retention of the key in depressed position is caused by its engaging with a catch-bar immediately upon depression, the engagement being interrupted as soon as the contacts are made. The contacts are made by the spring, which through depression of the key comes into metallic connection with (and solely with) the line-pole of the transmitting-battery, this metallic connection being continued through the cylinder and line wire, which runs from the cylinder to the receiving apparatus.

One form of carrying out the invention is shown on the accompanying drawings.

Figure l is a side elevation, and Fig. 2 a

plan view, of the apparatus. Fig. 3 is a side view, partly in section,'showing separately a lever-key and certain cooperating parts. Fig. shows thestartingaudbrakingdevice. Fig. 5 shows a portion of this device in connection with a key. Fig. 6 is a view of Fig. 5 looking in the direction of the arrow 1:. Fig. 7 is a View of the device for holding and freeing the key. Fig. 8 shows a view of Fig. 7 looking in the direction of the arrow on. Fig. 9 shows the course of the current, and Fig. 10 the same of a duplex transmitter.

0, Figs. 1 and 2, is a metallic cylinder rotating about its axis. Motion can be imparted to it by means of the wheelwork U. The cylinder 0 is divided into as many zones as there are letters, and these zones throughout the greater part of their surface have larger or shorter bright conducting places, as shown in the figure. The black places denote the non-conducting material or spaces. bright places during rotation of the cylinder come in connection with a contact-spring f,

Figs. 1, 2, and 3, which completes a batterycircuit.

Fig. 9 shows how the current is made on the depression of the key and how it runs through the springf to the receiving-station. Ono pole of the battery S is connected to earth and the other pole is in metallic connection with the bearing 11 and key If. If now the key t is brought out of the horizontal by depression of the button p, and the spring f, which is likewise in metallic connection with the These key, comes in contact with the cylinder C t. e., with the zone corresponding to the keythe current during rotation of the cylinder runs through the line L to the receiver M and thence to earth as often as bright parts pass, the period for which the current flows depending upon the length of the bright parts. Suppose now that the number and length of the bright parts are those of a Morse-alphabet letter. Itis clear that depression of a key during rotation of the cylinder will result in the transmission of a Morse letter to the Morse apparatus M. Assume that the rotation of the cylinder is the result of depression of the key and that continuousdepression is not necessary during rotation and, finally, that cessation of rotation occurs simultaneously with the springing up of the key. This being the case it is obvious that an instrument is provided capable of transmitting complete Morse signs and no further instruction is necessary than such as regards momentary depression of the correct key, which needs no skilled training. Furthermore, the instrument provides for high speed in the transmission of despatches, this depending entirely upon the manual dexterity of the sender.

Figs. 3, 4, 5, 6, 7, and 8 show the manner in which the assumptions mentioned above are realized by the present apparatus. Each of the keys t, Fig. 3, moves about a common axis d up and down between the stop-rails Each key is provided with a nose Z, which takes under the bar 10 on depression of the key. (See Fig. 7.) 'The farther end of the key on risinglifts a rod m, Figs. 1, 5, and 6, and approaches the spring fto the cylinder-i. e., to the corresponding zone.

The disk 61, Figs. 1 and 2, is rigidly connected with the cylinder and is rotated in the direction of the arrow, Figs. 4 and 5, by the wheelwork U immediately the pawl-lever s, turning at the fulcrum g, is disengaged from the nose at. This disengagement is effected when a key is momentarily depressed. The lever s is drawn toward the rod m by a spiral spring V, and only when the rod mis lifted can the end of the lever be freed from the nose a. Each end of the rod 'm is supported rigidly on an arm of the bent lever z, turning about the points 6, Figs. 1, 2, and 6. The result of this arrangement is that depression of a key causes uniform elevation of the rod m. When, however, the rod m is thus raised by the depression of a key, the lever s will likewise be raised, since the rod m under the lever 3 bears upward and toward the right. The disk at and cylinder 0 will now rotate, while the lever s will glide over the surface of the disk a and stop the rotation immediately it engages with the nose a. From the arrangement Figs. 4, 6, and 5 it is clear how the cylinder is caused to rotate and complete a revolution as soon as a key is depressed.

Figs. 7 and 8 show, first, how the key after depression remains in such position; sec ondly, why it rises when contactis made,and,

thirdly, why the cylinder after a complete revolution comes to rest. 1 and 2, is also rigidly connected with the cylinder 0 and is provided with a nose 03, Fig. 7, which when. the cylinder is at rest takes up a position above the axle opposite to the nose at of the disk a. The lever 0;, Figs. 1 and 7, is mounted on the bracket 3' and turns about the axle h. A spiral spring f holds the lever 11 to the surface of the disk b, so that the lever, on the cylinder rotating, first rises from the'surface of the disk I) and then snaps back upon the surface again.

The lever c has rigidly attached to it the frame a w h, Fig. 8, so that when it rises this frame moves to the left and then springs back toward the right as soon as the'nose of the lever 'u snaps down, as described. Thus depressionof a key causes the nose 1, Figs. 3 and 7, to engage the bar w through the spring f being for the moment overcome, whereupon the key can only rise when the bar to is moved aside. Further, the depression of the key operates, as described, the device whereby the wheelwork is started. From this it is clear that the key upon depression automatically remains in such position until the nose or; of the disk 1) reaches the highest point. The bar to will then spring from the nose l, and the key '25, under the influence of the spring V, springs up. Furthermore, since during depression of the key contacts are made causing transmission of a letter to a distant place it is obvious that the present invention forms an extremely simple means by which any one, without any special tech nical knowledge being necessary, may send a message with rapidity and certainty.

The present invention is also Well adapted for making contacts for a printing-telegraph. The apparatus could be used in connection with any suitable printing-telegraph with which a number of current impulses in one direction sets the type and then an impulse of current in the opposite direction effects the printing. In this case the arrangement would be such that on depressing a key instead of the contacts forming the Morse signs that number of contacts would be made which would set the required type at the receiver and then a contact (the same with each key) which would effect the transmission of a current impulse from a second battery in the opposite direction. For this purpose, in the case of a cylinder rotating, an extra disk 0, Fig. 2, may be provided, by means of which at each rotation after the type-setting contacts corresponding to the depressed key a contact is made, and thus an impulse of current passed from the second battery. This trans= mitting apparatus, as is obvious without detailed explanation, can also be employed for duplex and multiplex telegraphy by means of a suitable polarized relay. Several keyboards may be employed in such manner that, first, each keyboard sends a difierent kind of current, to which only the correspond- The disk 19, Figs.

ing receiver responds, and, second, the trans mission of the current only takes place at that fraction of the time of a cylinder rotation which corresponds'to each keyboard.

Fig. lOshows diagrammatically the arrangement and the course of the current when a dupleX transmitter is employed. The surface of the cylinder comprises two zones at and 5. The one zone i is in connection with the keyt of a keyboard on the right, the other zone 5 with the key of a second keyboard on the left. For the current to be transmitted by the key If a battery S (which, forinstance, sends plus currents) is provided, and for currents through the key 25 a battery S, (which sends minus currents.) If now the key if and at thesame time the key if of the righthand keyboard is depressed, the cylinder 0 and zones 4 and 5 will rotate. The bright parts or projections of the zone 5 (which onlyoccupya part of the circumference) come into contact with the contact spring f and momentary currents pass from S, the course of which is cl, f L, M M, to earth. These currents find expression at that receiver M (and only there) which responds to minus currents. Hereupon, however-2'. e., in the second fraction of the same rotation the bright. parts or projections of the zone 4 come in connection with the contact-spring), and currents thus pass from S over d, f, L, M M, and to earth, these currents finding expression only at the receiver M which responds to plus currents.

Having thus described my invention, what Iclaim as new, and desire to secure by Letters Patent, is

1. Automatic transmitter for Morse alphabet and printing telegraphy, comprising a cylinder divided into zones of conducting and non-conducting parts, wheelwork rotating said cylinder, lever-keys each provided with a catch Z, contact-springs f secured to said keys, a rod on located above said key ends and rocked by them, lever-arms z carrying said rod, a pivoted spring-lever 8 one end of which is raised by said rod on rocking, a disk a rigidly. connected with said cylinder. and provided with a nose Ct normally engaged by the other arm of said lever s, a frame having an upper bar mounted in bearings anda lower swinging bar engaging with said key-catches l,a spring-lever v secured to said upper framebar, and an eccentric b rigidly connected with said cylinder and operating said lever c, all arranged in such manner that on depression of a key the corresponding springf contacts with its-cylinder zone, the lever sis released from the disk at, the cylinder rotates, and the key is held down by the lower frame-bar until the cylinder has made a complete rotation,

when it is released by the eccentricb and thecylinder brought to rest, all substantially as described.

2. The devices for starting and stopping rotation of the transmitter-shaft, comprising in combination with keys each provided with. a catch 6 a rod m located above said key ends and rocked by them, lever-arms carrying said rod, a pivoted spring-lever 8 one end of which is raised by said rod m on rocking, a diska rigidly mounted on said shaft and provided with a nose a normally engaged by the other arm of said levers, a frame having an upper bar mounted in bearings and a lower swinging bar engaging with said key-catches Z, a spring-lever o secured to said upper framebar, and an eccentric b rigidly mounted on said shaft and operating said lever v, all sub-' stantially as described.

In testimony whereof I have signed this specification in the presence of two subscrib ing witnesses.

LUIGI CEREBOTANL Witnesses:

MARIE -VOGENRANFT, r THEREsE ETTL. 

